Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Apr. 02, 2021
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Organization Seagate Technology plc (“STX”) and its subsidiaries (collectively, unless the context otherwise indicates, the “Company”) is a leading provider of data storage technology and solutions. Its principal products are hard disk drives, commonly referred to as disk drives, hard drives or HDDs. In addition to HDDs, the Company produces a broad range of data storage products including solid state drives (“SSDs”), solid state hybrid drives (“SSHDs”) and storage subsystems. HDDs are devices that store digitally encoded data on rapidly rotating disks with magnetic surfaces. HDDs continue to be the primary medium of mass data storage due to their performance attributes, reliability, high quality and cost effectiveness. Complementing existing storage architectures, SSDs use integrated circuit assemblies as memory to store data, and most SSDs use NAND flash memory. In contrast to HDDs and SSDs, SSHDs combine the features of SSDs and HDDs in the same unit, containing a high-capacity HDD and a smaller SSD acting as a cache to improve performance of frequently accessed data. The Company’s HDD products are designed for mass capacity storage and legacy markets. Mass capacity storage supports high capacity, low-cost per terabyte storage applications, including nearline, video and image applications and network-attached storage. Legacy markets include mission critical, desktop, notebook, consumer, digital video recorders and gaming applications. These markets were previously categorized as enterprise servers and storage systems, edge non-compute applications and edge compute applications. The Company’s HDD and SSD product portfolio includes Serial Advanced Technology Attachment, Serial Attached SCSI and Non-Volatile Memory Express based designs to support a wide variety of mass capacity and legacy applications. The Company’s enterprise data solutions portfolio includes storage subsystems and mass capacity optimized private cloud storage solutions for enterprises and cloud and managed service providers. Engineered for modularity, mobility, mass capacity and performance, these solutions include the Company’s enterprise HDDs and SSDs, enabling customers to integrate powerful, scalable storage within legacy enterprise IT environments or build new on premises private storage clouds from the ground up in a secure, cost-effective manner. The Company’s other solutions include an edge-to-cloud mass storage platform, which is designed to reduce the cost and complexity associated with storing, moving and activating data at scale. Basis of Presentation and Consolidation The Company’s unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned and majority-owned subsidiaries, after elimination of intercompany transactions and balances. The preparation of financial statements in accordance with the United States (“U.S.”) generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the Company’s condensed consolidated financial statements and accompanying notes. These estimates and assumptions include the impact of the COVID-19 pandemic. Actual results could differ materially from those estimates. The methods, estimates and judgments the Company uses in applying its most critical accounting policies have a significant impact on the results the Company reports in its condensed consolidated financial statements. The Company’s consolidated financial statements for the fiscal year ended July 3, 2020 are included in its Annual Report on Form 10-K, as filed with the U.S. Securities and Exchange Commission (“SEC”) on August 7, 2020. The Company believes that the disclosures included in these unaudited condensed consolidated financial statements, when read in conjunction with its consolidated financial statements as of July 3, 2020, and the notes thereto, are adequate to make the information presented not misleading. Fiscal Year The Company operates and reports financial results on a fiscal year of 52 or 53 weeks ending on the Friday closest to June 30. In fiscal years with 53 weeks, the first quarter consists of 14 weeks and the remaining quarters consist of 13 weeks each. The three and nine months ended April 2, 2021 consisted of 13 and 39 weeks, respectively, and the three and nine months ended April 3, 2020 consisted of 13 and 40 weeks, respectively. Fiscal year 2021, which ends on July 2, 2021, is comprised of 52 weeks and fiscal year 2020, which ended on July 3, 2020, was comprised of 53 weeks. The fiscal quarters ended April 2, 2021, January 1, 2021 and April 3, 2020, are also referred to herein as the “March 2021 quarter”, the “December 2020 quarter” and the “March 2020 quarter”, respectively. The results of operations for the three and nine months ended April 2, 2021 are not necessarily indicative of the results of operations to be expected for any subsequent interim period or for the Company’s fiscal year ending July 2, 2021. Summary of Significant Accounting Policies There have been no material changes to the Company’s significant accounting policies disclosed in Note 1. Basis of Presentation and Summary of Significant Accounting Policies of “Financial Statements and Supplementary Data” contained in Part II, Item 8. of the Company’s Annual Report on Form 10-K for the fiscal year ended July 3, 2020, as filed with the SEC on August 7, 2020. Recently Adopted Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13 (ASC Topic 326), Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments. This ASU amends the requirement on the measurement and recognition of expected credit losses for financial assets held to include future conditions in its estimate of expected credit losses. The Company adopted this new accounting pronouncement in the quarter ended October 2, 2020. The adoption of this ASU did not have a material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU 2018-15 (ASC Subtopic 350-40), Intangibles—Goodwill and Other—Internal-Use Software—Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. This ASU aligns the accounting for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the accounting for implementation costs incurred to develop or obtain internal-use software. The Company adopted this new accounting pronouncement in the quarter ended October 2, 2020. The adoption of this ASU did not have a material impact on the Company’s condensed consolidated financial statements. Recently Issued Accounting Pronouncements In December 2019, the FASB issued ASU 2019-12 (ASC Topic 740), Simplifying the Accounting for Income Taxes. This ASU simplifies accounting for income taxes by removing certain exceptions to the general principles and amending existing guidance to improve consistent application. The Company is required to adopt this new accounting pronouncement in the first quarter of fiscal year 2022. Early adoption is permitted. The Company is in the process of assessing the impact of this ASU on its condensed consolidated financial statements. In March 2020, the FASB issued ASU 2020-04 (ASC Topic 848), Reference Rate Reform. This ASU provides optional expedients and exceptions for applying U.S. generally accepted accounting principles to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. Adoption of the expedients and exceptions is permitted upon issuance of this update through December 31, 2022. The Company is in the process of assessing the impact of this ASU on its condensed consolidated financial statements.